/*
 * Copyright 2022 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.drools.ruleunits.impl.datasources;

import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.function.Consumer;

import org.drools.ruleunits.api.DataProcessor;
import org.drools.ruleunits.api.DataSource;
import org.drools.ruleunits.impl.EntryPointDataProcessor;

public abstract class AbstractDataSource<T> implements DataSource<T> {

    protected final List<DataProcessor> subscribers = new CopyOnWriteArrayList<>();

    protected final List<EntryPointDataProcessor> entryPointSubscribers = new CopyOnWriteArrayList<>();

    @Override
    public void subscribe(DataProcessor<T> processor) {
        if (processor instanceof EntryPointDataProcessor) {
            entryPointSubscribers.add((EntryPointDataProcessor) processor);
        } else {
            subscribers.add(processor);
        }
    }

    protected void forEachSubscriber(Consumer<DataProcessor> consumer) {
        subscribers.forEach(consumer);
        entryPointSubscribers.forEach(consumer);
    }
}
